MSI: Remove some redundant null pointer checks.

[Mike McCormack]

ChangeLog:
Remove some redundant null pointer checks.

  dlls/msi/action.c  |   42 +++++++-----------------------------------
  dlls/msi/classes.c |   12 ------------
  dlls/msi/files.c   |    9 ---------
  dlls/msi/helpers.c |    7 ++-----
  4 files changed, 9 insertions(+), 61 deletions(-)

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